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Systematics of the Genus Sigmodon: DNA Sequences from Beta-Fibrinogen and Cytochrome b

Darin S. Carroll and Robert D. Bradley
The Southwestern Naturalist
Vol. 50, No. 3 (Sep., 2005), pp. 342-349
Stable URL: http://www.jstor.org/stable/3672478
Page Count: 8
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Systematics of the Genus Sigmodon: DNA Sequences from Beta-Fibrinogen and Cytochrome b
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Abstract

Nucleotide sequences from intron 7 of the beta-fibrinogen gene (Fgb-17) were used to evaluate phylogenetic relationships among members of the genus Sigmodon. In addition, these sequences were combined with mitochondrial cytochrome-b sequences and analyzed from a total evidence perspective. Results from parsimony and Bayesian analyses indicated support for 3 species groups (alstoni, fulviventer, and hispidus). A sister relationship was depicted for S. alleni and S. hirsutus, followed by the addition of S. toltecus; however, little resolution was provided for relationships between other members of the hispidus species group. /// Secuencias nucleótidas del intrón 7 del gene beta-fibrinogen (Fgb-17) fueron usadas para evaluar las relaciones filogenéticas entre los miembros del género Sigmodon. Además, estas secuencias fueron combinadas con secuencias del cytochrome-b mitocondrial y analizadas desde una perspectiva de evidencia total. Resultados de los análisis de parsimonia y de Bayes indicaron apoyo para 3 grupos de especies (alstoni, fulviventer y hispidus). S. alleni y S. hirsutus resultaron hermanas, y a este grupo se le añade S. toltecus, sin embargo, poca resolución fue obtenida entre otros miembros del grupo de especies de hispidus.

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